Lymph grows all over the human body, except for the bones and a few tissues, which are not covered by lymph. Lymph, also called lymphatic fluid, together with tissue fluid and blood plasma, constitutes the internal environment of the human body and is also called extracellular fluid. etc. In addition, the lymphatic system is also involved when someone is injured or when the local tissues are swollen, and the lymphatic circulation carries away the body fluids collected locally to restore the normal work of the tissues.